elem.attributes is null

Description

I have that error while trying 1.4.4 in our application. It works ok with 1.4.2. I'm still trying to find what element I'm passing to "attr" that makes this faild, but anyways, I think perhaps jQuery must check if elem.attributes is null before trying to access it.

If problem is more comples and you need for me to try and see what I'm passing to attr, please tell me.